Kurland, based in Uniondale, New York, has represented more than 30 lottery winners across the country since 2011, one of whom won $334 million.

"It sounds self-serving, but the first thing you should do is call us or an attorney you trust," said Kurland. "You want to start surrounding yourself with people who have the experience to do this sort of thing."

Even before the call to the lawyer, Kurland said, make sure you sign the winning ticket.

A lottery ticket is what is called a bearer instrument, a fancy term to say the holder is presumed to be the owner, he said.

So if you have a winning lottery ticket and drop it in the street without signing it, bad news: Whoever picks it up and signs it can claim the prize.

Danger in the office pool

Although frivolous lawsuits and family and friends coming out of the woodwork are big concerns, most problems for lotto winners stem from the dreaded office pool, Kurland said.

"Everyone dreams that they're going to win," he said. "But no one thinks they're going to win. You should treat it as a big transaction. If you do win, you want it done the right way."

Often times, co-workers chip in cash to buy lottery tickets for the office when a prize begins to balloon. When one of the ticket holders ends up winning, it can become a brawl to figure out who is actually entitled to the prize money. Those brawls often turn into lawsuits, Kurland said.

The best way to prevent litigation is to make copies of each ticket purchased and send the ticket numbers along with whom they belong to in an office pool email thread, Kurland said. That way, a judge can use the emails as proof of who gets the prize money.

However, without a paper trail, the discussion can become an ugly free-for-all.

"If there is no written proof, you are unfortunately putting yourself at the mercy of the courts," Kurland said.

Chicago lawyer Michael Haugh, agrees.

“The parties should sign a written contract, identifying each participant,” said Haugh, who represented the Dirty Dozen – a group of 12 coworkers at Pita Pan Old World Bakery in Chicago Heights, Illinois, who won a $118 million lottery drawing in 2012.

“Money has a way of corrupting people,” he said, “and when you get into the hundreds of millions of dollars, otherwise honest people might be tempted to present a claim they know is invalid.”

"If your name's out there, everyone comes out," Kurland said. "Not only family you haven’t spoken to in a long time, but charities. Mostly good. But some are bogus."

Lawyers will help winners vet the investment opportunities and charitable contributions, he said. Many attorneys, including Kurland, offer same-day service, with a midnight call being returned within hours rather than a day later, he said.

Most importantly, keeping quiet about a win is essential to savoring your life as it was before millions of dollars, Kurland said. It's something you can't get back.

"The ones that try to do it on their own, and then call me afterwards, spiral out of control," he said. "Because they're just not ready for it. Until you claim it, it’s your last moment of normalcy."